An option has been added to select how scraping is performed; It has four options: auto (default), native cURL calls, XenForo's client (Guzzle), or disabled. The default value is fine for the overwhelming majority of users so you don't have to care about it unless you use a special configuration for your network, in which case you should select the default XenForo client. Disabling scraping may prevent some content from being embedded.
The current default is to use native cURL calls because XenForo's client (Guzzle) does not seem support HTTP/2 at the moment. Future versions will eventually switch to use Guzzle, and the option will be removed.
In addition, defunct site Gfycat has been removed from the add-on and Facebook has been updated to support more video URLs.